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Step 9 (cont.) <br />FScR= Factor of Safety for creep to correlate the short term tensile strength <br />"r )at a specified strain (Z'ALL) to the Creep Limited Tensile Strength for <br />the required design life (Life) (per ASTM D5262) <br />FS,, s Factor of Safety for Durability to account for chemical and biological <br />degradation (per GRI GG4) <br />FS,) = Factor of Safety for installation Damage (per GRI G64) <br />FS„T = Factor of Safety for Joints at roll ends (per GRI GG4) <br />Step 10 <br />Determine if the selected geogrid is adequate <br />I.TADS Z TR <br />& 0 ►nF <br />Design Example Problem 0 <br />A new landfill is to be constructed on the sideslope of a closed landfill. The liner system <br />will consist ofa, 2 foot thick clay layer immediately below a 60 mil HDPE geomembrane. <br />A one foot thick sand layer acts as a leachate collection system above the geomembrane. <br />A non -woven filter geotextile is located between the leachate collection system and an <br />overlying 6 inch soil layer. The liner system will support one hundred feet of waste. The <br />engineering parameters for the soil and waste are as follows: <br />(9) <br />11 <br />Thickness (ft.) <br />Unit Weight (lbs/cl) <br />Effective Friction <br />Angle (degrees) <br />Clay <br />2 <br />130 <br />28 <br />Sand <br />1 <br />120 <br />32 <br />General Fill <br />.5 <br />120 <br />32 <br />MSW <br />100 <br />70 <br />25 <br />(9) <br />11 <br />